Hypodermic-needle base



- @et 16, i923.

A l Ll P. E. INGALLS HYPODERMIC NEEDLE BASE Filed Nov. 2o. 192e y@ QQ? Patented Get. 16, 1923. Y

PERRY E. INGALLS, 0F CHICAGO, ILLINOIS.

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HYPonERMrc-Nnnnnn BASE.

Application filed November 20, 1920. SerialNo. 425,355.

To all whom imag concern: Y

Be it known that I, PERRY E. INGALLS, a citizen of the United States, residing at Chicago, in thefcounty of Cook Vand State of Illinois, have invented certain new and useful Improvements in Hypodermic-Needle Bases, of `which the following is a specification.

This invention relates in general to hypodermic syringes adapted for medical and dental uses, but more particularly the inl vention relates to the needle base and to the means for securing the needle to the syringe barrel. I

Heretofore considerable difficulty and inconvenience has been experienced with devices of this character in that there is not formed a fluid tight joint between the needle base and the syringe barrel, with the result that as soon as pressure is exerted upon the y liquid in the syringe barrel to force the same through the needle, the liquid will flow through the said joint and not through the needle.

This objection has heretofore been overcome and remedied to a certain extent, by providing a washer between the needle base and the syringe barrel, but this washer quickly wears out and often times a washer is not present or handy when it is desired to use the device, owing to the fact that the washers become detached andl being small, are readily lost or misplaced when the needle is removed.

It is oneof the objects of the present invention to provide an improved needle base adapted to be screwed upon the end of the syringebarrel, a portion of the needle base adjacent the syringe barrel being constructl edl of a material softer than the remaining portion of the socket or base, or the portion of the syringe barrel yagainst which the v.needle base abuts when screwed upon the syringe, with the result that when the ductile material is forced against the abutting surface of the syringe barrel the ductile material will be compressed or flattened out to a sufficient extent, thereby causing the same n to seal the joint, while at the same time the removal of the needle from or the re-applying of the needle to the' syringe barrel will not be interfered with. y

To the attainment of these ends andthe accomplishment of other new and useful objects as will appear, the invention consists,

' Y in the features of novelty in substantially the construction, combination and arrangement rrlcr., f

of the several parts hereinaftermore fully f described| and aimed .and shown in the accompanying drawing illustrating this invention `and in whichi Figure 1 is an elevation of a syringe having a needle base constructed in accordance with the principles yof this invention applied thereto.

Figure 2l is an enlarged detail view partly in elevation and partly in longitudinal section.V

Figure 8 is an enlarged detail view partly in elevation and partly in section of the needle and base.

Referring more particularly to the drawing the numeral 10, designates the usual hypodermic syringebarrel having a needle 11, connected therewith. The needle 11, is con` nected with the needle base 12, which latter is provided with the usual passage 13, and a threaded recessed portion 14, into which the threaded extremity 15, of thegsyringe barrel 10, projects.

The lower extremity 16, of the needle base 12, is constructed of a ductile material which is somewhat softer than the adjacent portion of the base 12, and this portion 16, may be secured to the base 12, in any suitable manner but is preferably formed integral therewith, and if desired the threads 17, of the recess 14, may continueJ into the portion 16, of the base as at 1S. f

The base 12, is preferably provided with an angularlyshaped portion 19, to form a wrenchv seat. f l

In use, when the needle base 12, is screwed upon the projection 15, of the syringe barrel 10, the ductiler portion 16, of the base will stand adjacent a portion of the syringe barrel and when the base 12, is screwed upon the projection 15, and pressurel applied to the base, the ductilematerial 16, will be deflected or compressed sufficiently against the abutting portion of the syringe barrel so as to form a liquid or fluid tight joint between the needle base and the syringebarrel.V

This ductile portion 16, of the needle base is deflected only sufficiently sok as to form a tight /joint and not enough to injure the needle base so that it cannot be used over again, as thebase may be readily removed and rie-applied to the syringe barrel without impairing the efliciency of the needle base and can be used over and over again unt-il the needlev 11, becomes dull or otherwise injuredE While the intention has been herein shown and described as being` applied to a medical or hypodermic syringe, it is to be understood syringe base 12 may be varied, Within the scope of the claims.

What is claimed as new is:

l. A syringe barrel, a needle base, and a male and female threaded joint therebetween, the extremity of the female element being constructed of material sotter than the remaining portion ot' the element and also softer than the proximate portion of the other element, the extremity of the male element yprojecting into the female element to a. point beyond the softer portion of the latter, said `softer material being upset against the base ot the other element remote from the open extremity of the latter to Jform az Huid tight joint When the tWo elements are forced together.

, 2. A syringe barrel, a tubular internally tion of the syringe barrel when the duetile portion is forced thereagainst.

In testimony whereof I have signedr my name to this specification, on this 17th day of November, A. D. 1920. Y

` PERRY E.' INGALLS. 

